From Rooted in Rights' Electronic Visit Verification: a Threat to Independence for Disabled People:

"EVV proponents claim this will reduce fraud by confirming that people actually worked the hours they say they worked.  "You're putting in a technological solution that they're not asking for, for a problem that doesn't exist," says Borel.  Anti-EVV campaigners say there's no strong evidence for fraud in these settings, and that the cost of EVV far overrides any potential fraud-related savings.  Fraud is more commonly the result of bad billing practices at agencies, not a consumer-level issue."